updatePickerInput does not respond to reactive data - r

Question

I am putting together an Shiny app to allow users to upload an area of interest (AOI), and calculate the amount of overlap with an administrative boundary (WMU). Everything is working as desired, except that my picker input options do not update. The picker input works, but I would like the choices to only include the WMU that overlap the AOI instead of all possible WMU. I can calculate the WMU ID that should populate the list, shown in the "TEST_TEXT"output below the map frame, but cannot successfully update the pickerInput. This kmz will overlap the several WMU that are loaded at the beginning of the script included below:
library(shiny)
library(sf)
library(tidyverse)
library(bcdata)
library(shinyjs)
library(leaflet)
library(mapview)
library(DT)
library(pals)
library(shinyWidgets)
library(shinymanager)
WMU_DATA <-
bcdc_get_data("wildlife-management-units") %>% st_transform(4326) %>% mutate(Total.WMU.HA =
as.numeric(st_area(.)) / 10000)
##### UI #####
ui <- fluidPage(
tags$head(tags$style(
HTML(
".shiny-notification {
height: 100px;
width: 400px;
position:fixed;
top: calc(25% - 50px);;
left: calc(50% - 200px);;
}
"
)
)),
# Application title
titlePanel("Calculate Overlap With WMU"),
# Inputs
sidebarLayout(
sidebarPanel(
width = 3,
textInput(
inputId = "AOI_NAME",
label = "AOI Name",
value = NULL
),
HTML("<br><br>"),
fileInput(
inputId = "KMZ",
label = "Choose KMZ",
multiple = FALSE,
accept = c('.kmz')
),
h3("or"),
HTML("<br><br>"),
fileInput(
inputId = "SHAPEFILE",
label = "Choose shapefile",
multiple = TRUE,
accept = c('.shp', '.dbf', '.sbn', '.sbx', '.shx', '.prj', '.xml')
),
pickerInput(
inputId = "WMU_FILTER",
label = "Filter Overlapping WMU",
choices = unique(WMU_DATA$WILDLIFE_MGMT_UNIT_ID),
selected = unique(WMU_DATA$WILDLIFE_MGMT_UNIT_ID),
multiple = TRUE,
options = list(`actions-box` = TRUE)
),
HTML("<br><br>")
),
# Display OUtputs
mainPanel(
width = 9,
leafletOutput("OVERLAP_MAP", height = 750),
h3(textOutput("TEST_TEXT")),
DTOutput("AOI_OVERLAP_TABLE")
)
)
)
######server#####
server <- function(input, output, session) {
####reactive data
AOI <-
reactive({
if (is.null(input$SHAPEFILE) & !is.null(input$KMZ)) {
st_read(unzip(input$KMZ$datapath)) %>%
st_zm(drop = T) %>%
mutate(AOI_NAME = input$AOI_NAME) %>%
st_transform(4326) %>%
select(-Name)
}
else if (!is.null(input$SHAPEFILE) & is.null(input$KMZ)) {
SHAPEFILE()
}
else{
return(NULL)
}
})
WMU_OVERLAP <- reactive({
st_filter(WMU_DATA, AOI())
})
AOI_WMU_INTERSECT <-
reactive({
st_intersection(AOI(), WMU_OVERLAP()) %>%
mutate(`HA of Overlap` = round(as.numeric(st_area(.)) / 10000, 0)) %>%
mutate(`Percent of WMU` = round(`HA of Overlap` / `Total.WMU.HA` *
100, 2))
})
observeEvent(AOI_WMU_INTERSECT
,
{
updatePickerInput(
session,
"WMU_FILTER",
choices = unique(AOI_WMU_INTERSECT()$WILDLIFE_MGMT_UNIT_ID),
selected = unique(AOI_WMU_INTERSECT()$WILDLIFE_MGMT_UNIT_ID)
)
},
ignoreInit = TRUE,
ignoreNULL = TRUE)
###outputs
output$OVERLAP_MAP <-
renderLeaflet({
withProgress(message = "Calcualting Overlap", detail = "Should be done soon", {
AOI_SPATIAL <- AOI() %>% mutate(AOI_NAME = input$AOI_NAME)
WMU <-
WMU_OVERLAP() %>% filter(WILDLIFE_MGMT_UNIT_ID %in% input$WMU_FILTER)
Overlap <-
AOI_WMU_INTERSECT() %>% filter(WILDLIFE_MGMT_UNIT_ID %in% input$WMU_FILTER)
MAP <-
mapview(
Overlap,
zcol = "WILDLIFE_MGMT_UNIT_ID",
alpha.regions = 0.2,
map.types = c("Esri.WorldTopoMap", "Esri.WorldImagery"),
col.regions = alphabet(nlevels(
as.factor(WMU$WILDLIFE_MGMT_UNIT_ID)
))
) +
mapview(
WMU,
zcol = "WILDLIFE_MGMT_UNIT_ID",
alpha.regions = 0.2,
lwd = 3,
col.regions = alphabet(nlevels(
as.factor(WMU$WILDLIFE_MGMT_UNIT_ID)
)),
hide = TRUE
) +
mapview(AOI_SPATIAL,
label = "AOI_NAME",
col.regions = "red")
MAP#map %>%
setView(st_coordinates(st_centroid(st_as_sfc(
st_bbox(AOI_SPATIAL)
)))[, 1],
st_coordinates(st_centroid(st_as_sfc(
st_bbox(AOI_SPATIAL)
)))[, 2],
zoom = 9)
})
})
output$AOI_OVERLAP_TABLE <-
renderDT({
AOI_OVERLAP_TABLE <- AOI_WMU_INTERSECT() %>%
st_drop_geometry()
AOI_OVERLAP_TABLE
}, filter = "top", extensions = c("FixedHeader", "Buttons"),
options = list(
pageLength = 100,
fixedHeader = TRUE,
dom = "Bfrtip",
buttons = c('colvis', 'copy', 'excel', 'csv')
))
output$TEST_TEXT <-
renderText(unique(AOI_WMU_INTERSECT()$WILDLIFE_MGMT_UNIT_ID))
}
# Run the application
shinyApp(ui = ui, server = server)

Answer 1

Putting some req() and changing observeEvent() to observe() makes it work. Try this
######server#####
server <- function(input, output, session) {
####reactive data
AOI <-
reactive({
if (is.null(input$SHAPEFILE) & !is.null(input$KMZ)) {
st_read(unzip(input$KMZ$datapath)) %>%
st_zm(drop = T) %>%
mutate(AOI_NAME = input$AOI_NAME) %>%
st_transform(4326) %>%
select(-Name)
}
else if (!is.null(input$SHAPEFILE) & is.null(input$KMZ)) {
SHAPEFILE()
}
else{
return(NULL)
}
})
WMU_OVERLAP <- reactive({
req(AOI())
st_filter(WMU_DATA, AOI())
})
AOI_WMU_INTERSECT <-
reactive({
req(AOI(), WMU_OVERLAP())
st_intersection(AOI(), WMU_OVERLAP()) %>%
dplyr::mutate(`HA of Overlap` = round(as.numeric(st_area(.)) / 10000, 0)) %>%
dplyr::mutate(`Percent of WMU` = round(`HA of Overlap` / `Total.WMU.HA` *100, 2))
})
observe({updatePickerInput(
session,
"WMU_FILTER",
choices = unique(AOI_WMU_INTERSECT()$WILDLIFE_MGMT_UNIT_ID),
selected = unique(AOI_WMU_INTERSECT()$WILDLIFE_MGMT_UNIT_ID)
)
} )#, ignoreInit = TRUE, ignoreNULL = TRUE)
###outputs
output$OVERLAP_MAP <-
renderLeaflet({
req(AOI_WMU_INTERSECT())
withProgress(message = "Calcualting Overlap", detail = "Should be done soon", {
AOI_SPATIAL <- AOI() %>% dplyr::mutate(AOI_NAME = input$AOI_NAME)
WMU <-
WMU_OVERLAP() %>% dplyr::filter(WILDLIFE_MGMT_UNIT_ID %in% input$WMU_FILTER)
Overlap <-
AOI_WMU_INTERSECT() %>% dplyr::filter(WILDLIFE_MGMT_UNIT_ID %in% input$WMU_FILTER)
MAP <-
mapview(
Overlap,
zcol = "WILDLIFE_MGMT_UNIT_ID",
alpha.regions = 0.2,
map.types = c("Esri.WorldTopoMap", "Esri.WorldImagery"),
col.regions = alphabet(nlevels(
as.factor(WMU$WILDLIFE_MGMT_UNIT_ID)
))
) +
mapview(
WMU,
zcol = "WILDLIFE_MGMT_UNIT_ID",
alpha.regions = 0.2,
lwd = 3,
col.regions = alphabet(nlevels(
as.factor(WMU$WILDLIFE_MGMT_UNIT_ID)
)),
hide = TRUE
) +
mapview(AOI_SPATIAL,
label = "AOI_NAME",
col.regions = "red")
MAP#map %>%
setView(st_coordinates(st_centroid(st_as_sfc(
st_bbox(AOI_SPATIAL)
)))[, 1],
st_coordinates(st_centroid(st_as_sfc(
st_bbox(AOI_SPATIAL)
)))[, 2],
zoom = 9)
})
})
output$AOI_OVERLAP_TABLE <-
renderDT({
AOI_OVERLAP_TABLE <- AOI_WMU_INTERSECT() %>% st_drop_geometry()
AOI_OVERLAP_TABLE
}, filter = "top", extensions = c("FixedHeader", "Buttons"),
options = list(
pageLength = 100,
fixedHeader = TRUE,
dom = "Bfrtip",
buttons = c('colvis', 'copy', 'excel', 'csv')
))
output$TEST_TEXT <- renderText(unique(AOI_WMU_INTERSECT()$WILDLIFE_MGMT_UNIT_ID))
}